Picard values and normal families of meromorphic functions

Picard values and normal families of meromorphic functions
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DOI:
10.1017/s0308210508000462
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发表时间:
2009-09
期刊:
Proceedings of the Royal Society of Edinburgh: Section A Mathematics
影响因子:
--
通讯作者:
Yan Xu;Fengqin Wu;L. Liao
Yan Xu;Fengqin Wu;L. Liao
中科院分区:
其他
文献类型:
--
作者:
Yan Xu;Fengqin Wu;L. Liao

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设f是复平面ℂ上的超越亚纯函数,a是非零的有限复数,n和k是两个正整数。本文证明了:如果n≥k+1,则$\sMash{f+a(f^{(K)})^n}$无穷频繁地取每个值b∈ℂ。给出了亚纯函数族的相关正规判据。我们的结果推广了Fang和Zalcman的相关结果。
Let f be a transcendental meromorphic function on the complex plane ℂ, let a be a non-zero finite complex number and let n and k be two positive integers. In this paper, we prove that if n≥k+1, then $\smash{f+a(f^{(k)})^n}$ assumes each value b∈ℂ infinitely often. Also, the related normal criterion for families of meromorphic functions is given. Our results generalize the related results of Fang and Zalcman.